Nmap (Network Mapper) is a security scanner originally written by Gordon Lyon (also known by his pseudonym Fyodor Vaskovich) used to discover hosts and services on a computer network, thus creating a "map" of the network.

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Run ncat in background

from some time I'm trying to resolve very annoying issue: I need to have simple server which will listen on particular TCP port and throw all information which it recieve to trash. I'm doing it by ...
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“Nmap Scripting Engine” HTTP Requests

I looked into my nginx access logs to check who accessed my server and I noticed this line: <IP> - - [25/Feb/2016:02:49:12 +0100] "GET / HTTP/1.1" 302 160 "-" "Mozilla/5.0 (compatible; Nmap ...
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How best to enumerate a server network

What techniques do you typically use, when you start a gig at a complex environment and no one can tell you what servers are out there, and documentation doesn't exist? I typically start off with ...
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422 views

How do I test my firewall rules?

I've setup some rules in ufw and I've turned it on. Now I want to ensure my rules actually block traffic. However, when running nmap -PN -p <my_port> <ip> from my local workstation it ...
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943 views

Nmap external scan shows port open, ASA says port is not open, but do get an socket

Folks, have a weird one, need your expert help. For one of our heavily used external facing server which came up in an audit, nmap -Pn scan shows the following: Starting Nmap 5.51 ... Host ...
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210 views

Port 80 filtered nmap

Suddenly my server's port 80 is shown as filtered (no server changes are made). My sites are sometimes timing out or stays in waiting for a very long time (in browser). My 1&1 tech support is of ...
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50 views

nmap silent with specific installation directory

Anyone have try to do the installation? it always install to c:\program files\WinPcap directory regardless of the parameter winpcap-nmap-4.02.exe /S /D="C:\tools\WinPcap\" http://seclists.org/nmap-...
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74 views

getting a list of live assets using nmap and script?

I'm playing around with a way to find all network assets from the command line that will return an IP, a hostname, and then have a way to see all interfaces associated with that host. I was using ...
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46 views

Azure NAT blocking connections

When I try to connect to a port on the public IP address of a node, 50% of the time Azure doesn't respond and nmap marks it as "filtered". When I try to connect to the same port from the node using ...
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585 views

ACL Rule to Open UDP Ports

I have the current rules in an attempt to open port 5060 and 10000-20000 for my VoIP provider. We are on a Cisco 1921 router. This ACL is applied to the WAN port on the router facing the ISP. Nmap ...
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105 views

Network audit tracker

I'm looking for a tool like PBNJ (http://pbnj.sourceforge.net/) but not quite. The functionality I'm looking for is something I can throw into cron to run daily or weekly, scan a network(s), store the ...
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Nmap how to split and filter this(regex)?

I think i need a regex code to filter nmap output.txt I use a tool called: Word List Updater 2.7 so this is the output: http://pastebin.com/HwgiVHDA I want to filter,remove duplicates and look like ...
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55 views

cant scan and ping my ip from outside

when I scan my network using nmap it gives me something like this #nmap -vv -Pn -sV -sT -p80 -oG - 116.135.*.* # Ports scanned: TCP(1;80) UDP(0;) SCTP(0;) PROTOCOLS(0;) Host: 116.135.*.* () Status:...
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54 views

Logstash nmap codec @timestamp match

I am using Logstash to input NMAP scan data into Elasticsearch. input{ http{ host => "127.0.0.1" port => 8000 codec => nmap } }...
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2k views

Issue with Netgear GS108T Managed Switch and Jumbo Frames

I recently purchased a Netgear GS108T managed switch and I am trying to configure jumbo packets between my NAS (Thecus N4100Pro), PC and managed switch. I should mention the fact that I was able to ...
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74 views

One device shows down when more than 160 ip addresses are scanned with nmap

This is bugging me. I consistently have a single device that fails to respond to an nmap scan when more than ~160 IP addresses are specified. I seem to get mixed results between 150-160 IP addresses ...
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255 views

Why does scanlogd miss port scans?

I am running scanlogd to detect port scans. I have observed the following to generate a log message in /var/log/syslog. When I use zenmap (nmap gui) to port scan this system from another computer on ...
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Nmap SYN Scan blocks all connections?

I have ServerA (running Ubuntu 12.04 (IP: 10.10.10.200)), a KVM DomU of an also Ubuntu Dom0 that is trying to perform a scan against ServerB-ServerZ (Mixed OS (IPs:10.10.10.20-199)) using the command: ...
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779 views

nmap port scan for vpn and proxies

I am trying to detect the vpn and proxies from the iplist so is anyone know the fastest and reliable scan command for nmap? right now I am using this nmap -sS -sU -T4 -A -v -PE -PP -PS21,22,23,25,80,...
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71 views

“Filtered” port when accessing server

I'm having periodic trouble accessing one of my DigitalOcean servers from Azure machines. I have isolated a test that - I believe - demonstrates the issue and captured a tcpdump from the server for ...
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103 views

NMAP port scanning - inconsistent results

I ran the same nmap commands subsequently, and got two sets of results. I know that there are three open ports, but on each run, only two are shown. Can anyone explain these results? ramses@deimos:~...
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251 views

Unknown device showing up in network scan

I need some help finding a device that has been showing up whenever I scan my network using Spiceworks' "Inventory" scan. I can ping the device, but nslookup returns a non-existent domain, and ...
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outlook doing remote portscanning

A while ago I switched my mailbox on another domain and configured outlook with an exchange server on that domain. Recently for some strange reason my hosting provider has been complaining that ...